Feuling has created the ECONO performance BEEHIVE valve springs designed to handle up to 585 lift camshafts at an economical price These Feuling BEEHIVE springs are made from the same premium stress relieved conical ovate wire as our HIGH LOAD springs but are developed for economical engine budgets They have an excellent level of fatigue life and are designed to handle the demands of performance engines with 585 and smaller lift camshafts Dyno proven and track tested Kits include: Feuling ECONO BEEHIVE valve springs, lightweight 7 steel retainers, machined heat treated chrome moly spring seats, seat shims, valve locks and a set of premium Viton valve seals equipped with a spring loaded valve stem wiper system Spring pressures are 183 lb. at .510" lift,172 lb. at .553" lift,163 lb. .585" lift